Many users are looking for a way to benefit from the possibilities of the 4-Pin-PWM-Controller even with conventional 3-Pin fans, e.g. using a 3-pin CPU fan on PWM-enabled mainboards. The Developers at Nanoxia tackled this dilemma and came up with a solution: With the brand new PWMX Controller it is now possible to control all 3-pin fans via PWM.

The Nanoxia controller chip detects the connected fan and generates fitting PWM characteristics. This way, every fan can be accessed perfectly by a PWM-enabled mainboard. Contrary to pure PWM solutions, the PWMX Controller allows to regulate the supply voltage of the fan, thereby offering a higher level of adjustment, e.g. reducing the maximum rotation speed of the fan while still react to current CPU load.

That unit looks nice and its 2/3 the price of mine - depending on how much they charge for delivery, of course, which my price includes (for the UK). I figure they have gone for a high volume production process.

By contrast the PaQ PWM->DC unit has a control on the min speed, but not on the max (100%) fan speed.

I would tend to control the max speed simply by buying a fan whose max speed was whatever I wanted. If you do that you get fan speed control at both ends.

We developed the PaQ unit because we needed it for the CPU cooling on the PaQ case, and only sold it separately because we had it. We ended up using low speed 140mm Yate Loon fans on the CPU cooler - they run at 950 rpm at 12V; and, typically, I set them so to run at 400 rpm when the machine is ideling.

Under further testing , it looks that the voltage output of the controller that I got, are from 8,6V to 10,4 volts ( at 100% PWM ) .

And so the actual RPM difference from Min to Max , it is related to the fan type , that will be used with it .

Even so , from my tests with an 140mm 1000 RPM , the RPM change was 140 rotations .And with an 120mm 2400 RPM about 210 rotations. (Min to Max pot change)

Technically this measurements , indicates elusive specs . especially if this controller are suggested for operation with 5 Volt fans up to 12V.And this information indicates that the minimum output voltage , it should be 5V and not 8.6 !!

It will be really nice , if some one who owns the Nanoxia , to also verify the output voltages.And post here the results .

I did my measurements without the fan attached. I also measured the fans RPM's both with and without the Nanxia. The fan spins at 1314 RPM when connected directly to the fan header. When connected through the Nanoxia, it spins at 1214 RPM. That's an 8% decrease, which I'm guessing is consistent with the voltages I measured.

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